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      <h3>配置和使用</h3>
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              下载
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              配置和开始使用
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      <h3>Drawee 指南</h3>
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              在XML中使用 Drawees
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              在Java代码中使用 Drawees
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              Drawee的各种效果配置
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              渐进式JPEG图
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              配置Image Pipeline
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              直接使用Image Pipeline
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              自定义网络加载
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              使用其他的Image Loader
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<article class='withtoc'>
    <h1>
      Using Other Network Layers
      <a class="edit-page-link" href="https://github.com/liaohuqiu/fresco-docs-cn/blob/docs/docs/03-using-other-network-layers.md" target="_blank">编辑和纠错</a>
    </h1>
    <p></p>

    <p>Image pipeline 默认使用<a href="https://developer.android.com/training/basics/network-ops/connecting.html">HttpURLConnection</a>。应用可以根据自己需求使用不同的网络库。</p>

<h3>OkHttp</h3>

<p><a href="http://square.github.io/okhttp">OkHttp</a> 是一个流行的开源网络请求库。Image
pipeline有一个使用OkHttp替换掉了Android默认的网络请求的补充。</p>

<p>如果需要使用OkHttp,
不要使用这个<a href="download-fresco.html">下载</a>页面的gradle依赖配置，应该使用下面的依赖配置</p>
<div class="highlight"><pre><code class="language-groovy" data-lang="groovy"><span class="n">dependencies</span> <span class="o">{</span>
  <span class="c1">// your project&#39;s other dependencies</span>
  <span class="nl">compile:</span> <span class="s2">&quot;com.facebook.fresco:drawee:0.1.0+&quot;</span>
  <span class="nl">compile:</span> <span class="s2">&quot;com.facebook.fresco:imagepipeline-okhttp:0.1.0+&quot;</span>
<span class="o">}</span>
</code></pre></div>
<p>配置Image
pipeline这时也有一些不同，不再使用<code>ImagePipelineConfig.newBuilder</code>,而是使用<code>OkHttpImagePipelineConfigFactory</code>:</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">Context</span> <span class="n">context</span><span class="o">;</span>
<span class="n">OkHttpClient</span> <span class="n">okHttpClient</span><span class="o">;</span> <span class="c1">// build on your own</span>
<span class="n">ImagePipelineConfig</span> <span class="n">config</span> <span class="o">=</span> <span class="n">OkHttpImagePipelineConfigFactory</span>
    <span class="o">.</span><span class="na">newBuilder</span><span class="o">(</span><span class="n">context</span><span class="o">,</span> <span class="n">okHttpClient</span><span class="o">)</span>
    <span class="o">.</span> <span class="c1">// other setters</span>
    <span class="o">.</span> <span class="c1">// setNetworkFetchProducer is already called for you</span>
    <span class="o">.</span><span class="na">build</span><span class="o">();</span>
<span class="n">Fresco</span><span class="o">.</span><span class="na">initialize</span><span class="o">(</span><span class="n">context</span><span class="o">,</span> <span class="n">config</span><span class="o">);</span>
</code></pre></div>
<h3>使用自定的网络层</h3>

<p>For complete control on how the networking layer should behave, you can provide one for your app. You must subclass 
为了完全控制网络层的行为，你可以自定义网络层。继承<a href="../javadoc/reference/com/facebook/imagepipeline/producers/NetworkFetchProducer.html">NetworkFetchProducer</a>, 这个类包含了网络通信。</p>

<p>你也可以选择性地继承<a href="../javadoc/reference/com/facebook/imagepipeline/producers/NfpRequestState.html">NfpRequestState</a>, 这个类是请求时的数据结构描述。</p>

<p>默认的 <code>HttpURLConnection</code> 可以作为一个参考. 源码在这 <a href="https://github.com/facebook/fresco/blob/master/imagepipeline/src/main/java/com/facebook/imagepipeline/producers/HttpURLConnectionNetworkFetchProducer.java">its source code</a>.</p>

<p>在<a href="configuring-image-pipeline.html">配置Image pipeline</a>时，把producer传递给Image pipeline。</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">ImagePipelineConfig</span> <span class="n">config</span> <span class="o">=</span> <span class="n">ImagePipelineConfig</span><span class="o">.</span><span class="na">newBuilder</span><span class="o">()</span>
  <span class="o">.</span><span class="na">setNetworkFetchProducer</span><span class="o">(</span><span class="n">myNetworkFetchProducer</span><span class="o">);</span>
  <span class="o">.</span> <span class="c1">// other setters</span>
  <span class="o">.</span><span class="na">build</span><span class="o">();</span>
<span class="n">Fresco</span><span class="o">.</span><span class="na">initialize</span><span class="o">(</span><span class="n">context</span><span class="o">,</span> <span class="n">config</span><span class="o">);</span>
</code></pre></div>

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